Windows® users warned of a new Trojan
The users of computers running on Microsoft Windows operating systems were warned by BitDefender Malware City blog this week against a new malware that exploits a bug to hijack a critical file and remain hidden and active in the system.
The complex Trojan has been identified as Trojan.Dropper.UAJ, which eludes detection by antivirus software by not adding itself to the lists of programs that run at startup.
”Trojan.Dropper.UAJ comes with its own approach – it patches a vital code library (comres.dll) forcing all applications that rely on comres.dll to execute this particular e-threat, as well," said the Malware City blog from BitDefender.
According to BitDefender, comres.dll is widely used by most of the Internet browsers, in some communication applications or networking tools. This makes it indispensable for the Windows operating system. The blog further says that the Trojan makes a copy of the original comres.dll file, patches it, and then saves it in the Windows directory folder, where the operating system normally looks for a DLL (dynamic-link library) to load when it is required.
Further, BitDefender says that the Trojan.Dropper.UAJ can run on Windows7, Windows Vista, Windows 2003, Windows 2000 or Windows NT operating systems in both 32- and 64-bit environments.